OS (operating system) is an important software in an application, if in a PC or laptop no operating system, like a blind user can not see what users are doing.

Of some existing OS, Linux has been growing very rapidly.K is linux we can get them for free because it's own linux linux open source means thatS O software that freedom so we can get it without a license. and d asr-linux base is made ​​of the C programming language languages ​​linux so rarely infected with the virus.